package cn.qiujing.java.study.demo.sftp;

import com.jcraft.jsch.*;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import java.io.*;
import java.util.Properties;
import java.util.Vector;

/**
 * @author shansm
 * @date 2020/3/18 -17:27
 */
public class SFTPUtil {

    private transient Logger log = LoggerFactory.getLogger(this.getClass());

    private ChannelSftp sftp;

    private Session session;
    /**
     * SFTP 登录用户名
     */
    private String username;
    /**
     * SFTP 登录密码
     */
    private String password;
    /**
     * 私钥
     */
    private String privateKey;
    /**
     * SFTP 服务器地址IP地址
     */
    private String host;
    /**
     * SFTP 端口
     */
    private int port;


    /**
     * 构造基于密码认证的sftp对象
     */
    public SFTPUtil(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }

    /**
     * 构造基于秘钥认证的sftp对象
     */
    public SFTPUtil(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }

    public SFTPUtil() {
    }

    /**
     * 初始化ftp参数
     * @param resultFileURL
     */
//    public SFTPUtil(String resultFileURL , String keys) throws Exception {
//        Map<String, String> map = URLUtil.parseSftp(resultFileURL);
//        init(map.get("ipAddress"),map.get("ipPort"),map.get("userName"),map.get("passWord"),keys);
//        log.info("ip: "+map.get("ipAddress"));
//        log.info("port: "+map.get("ipPort"));
//        log.info("userName: "+map.get("userName"));
//        log.info("PassWord: "+map.get("passWord"));
//    }

    /**
     * 初始化参数
     **/
    private void init(String ip, String portN, String userName, String passWord, String keys)
            throws Exception {
        if (StringUtils.isNotEmpty(portN)) {
            port = Integer.parseInt(portN);
        } else {
            port = 21;
        }

        if (StringUtils.isNotEmpty(keys)) {
            privateKey = keys;
        }

        host = new String(ip);
        sftp = new ChannelSftp();
        username = new String(userName);
        password = new String(passWord);
    }


    /**
     * 连接sftp服务器
     */
    public void login() {
        try {
            JSch jsch = new JSch();
            if (privateKey != null) {
                jsch.addIdentity(privateKey);// 设置私钥
            }

            session = jsch.getSession(username, host, port);

            if (password != null) {
                session.setPassword(password);
            }
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");

            session.setConfig(config);
            session.connect();

            Channel channel = session.openChannel("sftp");
            channel.connect();

            sftp = (ChannelSftp) channel;
            log.info("登陆 Sftp Server Success");
        } catch (JSchException e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
    }

    /**
     * 关闭连接 server
     */
    public void logout() {
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }

    /**
     * 将输入流的数据上传到sftp作为文件。文件完整路径=basePath+directory
     *
     * @param basePath     服务器的基础路径
     * @param directory    上传到该目录
     * @param sftpFileName sftp端文件名
     */
    public void upload(String basePath, String directory, String sftpFileName, InputStream input) throws SftpException {
        try {
            sftp.cd(basePath);
            sftp.cd(directory);
        } catch (SftpException e) {
            //目录不存在，则创建文件夹
            String[] dirs = directory.split("/");
            String tempPath = basePath;
            for (String dir : dirs) {
                if (null == dir || "".equals(dir)) continue;
                tempPath += "/" + dir;
                try {
                    sftp.cd(tempPath);
                } catch (SftpException ex) {
                    sftp.mkdir(tempPath);
                    sftp.cd(tempPath);
                }
            }
        }
        //上传文件
        sftp.put(input, sftpFileName);
    }


    /**
     * 下载文件。
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件
     * @param saveFile     存在本地的路径
     */
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        File file = new File(saveFile);
        sftp.get(downloadFile, new FileOutputStream(file));
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     */
    public byte[] download(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        InputStream is = sftp.get(downloadFile);

        byte[] fileData = IOUtils.toByteArray(is);

        return fileData;
    }


    /**
     * 删除文件
     *
     * @param directory  要删除文件所在目录
     * @param deleteFile 要删除的文件
     */
    public void delete(String directory, String deleteFile) throws SftpException {
        sftp.cd(directory);
        sftp.rm(deleteFile);
    }


    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     */
    public Vector<?> listFiles(String directory) throws SftpException {
        return sftp.ls(directory);
    }

    //上传文件测试
    public static void main(String[] args) throws SftpException, IOException {
        SFTPUtil sftp = new SFTPUtil("root", "test", "1.15.104.227", 22);
        sftp.login();
//        File file = new File("/Users/qiujing/study/从0开始学习JVM.pdf");
//        InputStream is = new FileInputStream(file);
//        sftp.upload("/root", "upload", "从0开始学习JVM.pdf", is);


//        File file = new File("/Users/qiujing/study/统一消息服务设计.docx");
//        InputStream is = new FileInputStream(file);
//        sftp.upload("/root", "upload", "统一消息服务设计.docx", is);
        sftp.getFtpContent("/root/upload/统一消息服务设计.docx");
        sftp.logout();
    }

    /***
     * 获取ftp内容
     * @param path
     * @return
     */
    public String getFtpContent(String path) {
        String str = null;
        log.info("SFTP getFtpContent Start");
        try {
            path = path.replace("//", "/"); //防止双杠导致目录失败
            log.info("ftp path=" + path);
            /*String changePath = path.substring(0, path.lastIndexOf("/")+1);
            log.info("ftp changePath="+changePath);*/
            InputStream inputStream = sftp.get(path);
            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));
            String data = null;
            StringBuffer resultBuffer = new StringBuffer();
            while ((data = br.readLine()) != null) {
                resultBuffer.append(data + "\n");
            }
            str = resultBuffer.toString();
            log.info("ftp content:" + str);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            log.error("ftp error:", e);
        }
        return str;
    }
}
